Blame - tests/PolyUtilsTest.cpp - platform/external/skia

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/*

*

* Use of this source code is governed by a BSD-style license that can be

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* found in the LICENSE file.

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*/

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#include "Test.h"

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#include "SkPolyUtils.h"

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DEF_TEST(PolyUtils, reporter) {

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SkTDArray<SkPoint> poly;

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// init simple index map

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uint16_t indexMap[1024];

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for (int i = 0; i < 1024; ++i) {

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indexMap[i] = i;

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}

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SkTDArray<uint16_t> triangleIndices;

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// skinny triangle

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*poly.push() = SkPoint::Make(-100, 55);

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*poly.push() = SkPoint::Make(100, 55);

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*poly.push() = SkPoint::Make(102.5f, 54.330127f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

&triangleIndices));

// switch winding

poly[2].set(102.5f, 55.330127f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

&triangleIndices));

// make degenerate

poly[2].set(100 + 2.5f, 55);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) == 0);

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// TODO: should these fail?

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

&triangleIndices));

// giant triangle

poly[0].set(-1.0e+37f, 1.0e+37f);

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poly[1].set(1.0e+37f, 1.0e+37f);

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poly[2].set(-1.0e+37f, -1.0e+37f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

&triangleIndices));

// teeny triangle

poly[0].set(-1.0e-38f, 1.0e-38f);

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poly[1].set(-1.0e-38f, -1.0e-38f);

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poly[2].set(1.0e-38f, 1.0e-38f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) == 0);

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// TODO: should these fail?

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// triangle way off in space (relative to size so we don't completely obliterate values)

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poly[0].set(-100 + 1.0e+9f, 55 - 1.0e+9f);

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poly[1].set(100 + 1.0e+9f, 55 - 1.0e+9f);

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poly[2].set(150 + 1.0e+9f, 100 - 1.0e+9f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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///////////////////////////////////////////////////////////////////////

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// round rect

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poly.rewind();

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*poly.push() = SkPoint::Make(-100, 55);

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*poly.push() = SkPoint::Make(100, 55);

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*poly.push() = SkPoint::Make(100 + 2.5f, 50 + 4.330127f);

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*poly.push() = SkPoint::Make(100 + 3.535534f, 50 + 3.535534f);

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*poly.push() = SkPoint::Make(100 + 4.330127f, 50 + 2.5f);

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*poly.push() = SkPoint::Make(105, 50);

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*poly.push() = SkPoint::Make(105, -50);

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*poly.push() = SkPoint::Make(100 + 4.330127f, -50 - 2.5f);

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*poly.push() = SkPoint::Make(100 + 3.535534f, -50 - 3.535534f);

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*poly.push() = SkPoint::Make(100 + 2.5f, -50 - 4.330127f);

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*poly.push() = SkPoint::Make(100, -55);

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*poly.push() = SkPoint::Make(-100, -55);

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*poly.push() = SkPoint::Make(-100 - 2.5f, -50 - 4.330127f);

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*poly.push() = SkPoint::Make(-100 - 3.535534f, -50 - 3.535534f);

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*poly.push() = SkPoint::Make(-100 - 4.330127f, -50 - 2.5f);

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*poly.push() = SkPoint::Make(-105, -50);

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*poly.push() = SkPoint::Make(-105, 50);

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*poly.push() = SkPoint::Make(-100 - 4.330127f, 50 + 2.5f);

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*poly.push() = SkPoint::Make(-100 - 3.535534f, 50 + 3.535534f);

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*poly.push() = SkPoint::Make(-100 - 2.5f, 50 + 4.330127f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// translate far enough to obliterate some low bits

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for (int i = 0; i < poly.count(); ++i) {

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poly[i].offset(1.0e+7f, 1.0e+7f);

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}

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);

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// Due to floating point error it's no longer convex

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REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// translate a little farther to create some coincident vertices

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for (int i = 0; i < poly.count(); ++i) {

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poly[i].offset(4.0e+7f, 4.0e+7f);

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}

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) < 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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// This can't handle coincident vertices

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// troublesome case -- clipped roundrect

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poly.rewind();

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*poly.push() = SkPoint::Make(335.928101f, 428.219055f);

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*poly.push() = SkPoint::Make(330.414459f, 423.034912f);

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*poly.push() = SkPoint::Make(325.749084f, 417.395508f);

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*poly.push() = SkPoint::Make(321.931946f, 411.300842f);

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*poly.push() = SkPoint::Make(318.963074f, 404.750977f);

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*poly.push() = SkPoint::Make(316.842468f, 397.745850f);

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*poly.push() = SkPoint::Make(315.570068f, 390.285522f);

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*poly.push() = SkPoint::Make(315.145966f, 382.369965f);

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*poly.push() = SkPoint::Make(315.570068f, 374.454346f);

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*poly.push() = SkPoint::Make(316.842468f, 366.994019f);

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*poly.push() = SkPoint::Make(318.963074f, 359.988892f);

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*poly.push() = SkPoint::Make(321.931946f, 353.439056f);

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*poly.push() = SkPoint::Make(325.749084f, 347.344421f);

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*poly.push() = SkPoint::Make(330.414459f, 341.705017f);

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*poly.push() = SkPoint::Make(335.928101f, 336.520813f);

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*poly.push() = SkPoint::Make(342.289948f, 331.791901f);

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*poly.push() = SkPoint::Make(377.312134f, 331.791901f);

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*poly.push() = SkPoint::Make(381.195313f, 332.532593f);

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*poly.push() = SkPoint::Make(384.464935f, 334.754700f);

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*poly.push() = SkPoint::Make(386.687042f, 338.024292f);

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*poly.push() = SkPoint::Make(387.427765f, 341.907532f);

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*poly.push() = SkPoint::Make(387.427765f, 422.832367f);

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*poly.push() = SkPoint::Make(386.687042f, 426.715576f);

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*poly.push() = SkPoint::Make(384.464935f, 429.985168f);

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*poly.push() = SkPoint::Make(381.195313f, 432.207275f);

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*poly.push() = SkPoint::Make(377.312134f, 432.947998f);

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*poly.push() = SkPoint::Make(342.289948f, 432.947998f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);

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REPORTER_ASSERT(reporter, SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// a star is born

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poly.rewind();

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*poly.push() = SkPoint::Make(0.0f, -50.0f);

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*poly.push() = SkPoint::Make(14.43f, -25.0f);

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*poly.push() = SkPoint::Make(43.30f, -25.0f);

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*poly.push() = SkPoint::Make(28.86f, 0.0f);

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*poly.push() = SkPoint::Make(43.30f, 25.0f);

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*poly.push() = SkPoint::Make(14.43f, 25.0f);

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*poly.push() = SkPoint::Make(0.0f, 50.0f);

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*poly.push() = SkPoint::Make(-14.43f, 25.0f);

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*poly.push() = SkPoint::Make(-43.30f, 25.0f);

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*poly.push() = SkPoint::Make(-28.86f, 0.0f);

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*poly.push() = SkPoint::Make(-43.30f, -25.0f);

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*poly.push() = SkPoint::Make(-14.43f, -25.0f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);

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REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// many spiked star

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{

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const SkScalar c = SkIntToScalar(45);

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const SkScalar r1 = SkIntToScalar(20);

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const SkScalar r2 = SkIntToScalar(3);

const int n = 500;

poly.rewind();

SkScalar rad = 0;

const SkScalar drad = SK_ScalarPI / n;

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for (int i = 0; i < n; i++) {

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SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);

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*poly.push() = SkPoint::Make(c + cosV * r1, c + sinV * r1);

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rad += drad;

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sinV = SkScalarSinCos(rad, &cosV);

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*poly.push() = SkPoint::Make(c + cosV * r2, c + sinV * r2);

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rad += drad;

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}

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);

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REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

&triangleIndices));

}

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// self-intersecting polygon

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poly.rewind();

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*poly.push() = SkPoint::Make(0.0f, -50.0f);

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*poly.push() = SkPoint::Make(14.43f, -25.0f);

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*poly.push() = SkPoint::Make(43.30f, -25.0f);

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*poly.push() = SkPoint::Make(-28.86f, 0.0f);

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*poly.push() = SkPoint::Make(43.30f, 25.0f);

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*poly.push() = SkPoint::Make(14.43f, 25.0f);

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*poly.push() = SkPoint::Make(0.0f, 50.0f);

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*poly.push() = SkPoint::Make(-14.43f, 25.0f);

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*poly.push() = SkPoint::Make(-43.30f, 25.0f);

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*poly.push() = SkPoint::Make(28.86f, 0.0f);

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*poly.push() = SkPoint::Make(-43.30f, -25.0f);

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*poly.push() = SkPoint::Make(-14.43f, -25.0f);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) > 0);

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REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, !SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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// running this just to make sure it doesn't crash

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// the fact that it succeeds doesn't mean anything since the input is not simple

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REPORTER_ASSERT(reporter, SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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// self-intersecting polygon with coincident point

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poly.rewind();

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*poly.push() = SkPoint::Make(0.0f, 0.0f);

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*poly.push() = SkPoint::Make(-50, -50);

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*poly.push() = SkPoint::Make(50, -50);

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*poly.push() = SkPoint::Make(0.00000001f, -0.00000001f);

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*poly.push() = SkPoint::Make(-50, 50);

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*poly.push() = SkPoint::Make(50, 50);

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REPORTER_ASSERT(reporter, SkGetPolygonWinding(poly.begin(), poly.count()) == 0);

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REPORTER_ASSERT(reporter, !SkIsConvexPolygon(poly.begin(), poly.count()));

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REPORTER_ASSERT(reporter, !SkIsSimplePolygon(poly.begin(), poly.count()));

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triangleIndices.rewind();

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// running this just to make sure it doesn't crash

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REPORTER_ASSERT(reporter, !SkTriangulateSimplePolygon(poly.begin(), indexMap, poly.count(),

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&triangleIndices));

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}